org.openrdf.sesame.sail
Interface ValueIterator

All Known Subinterfaces:

LiteralIterator, ResourceIterator

All Known Implementing Classes:

EmptyLiteralIterator, EmptyResourceIterator, EmptyValueIterator, MemLiteralIterator, MemResourceIterator, NestedResourceIterator, NestedValueIterator, RdbmsLiteralIterator, RdbmsResourceIterator, RdbmsValueIterator, ResourceCollectionIterator, ResourceFilterIterator, SingleResourceIterator, SingleValueIterator, StatementObjectIterator, StatementSubjectIterator, ValueCollectionIterator

public interface ValueIterator

An iterator over Values that are stored in RDF Sails.

Version:

$Revision: 1.6.2.2 $

Author:

Arjohn Kampman

Method Summary

void	close() Closes the iterator and frees any resources that it uses (e.g.
boolean	hasNext() Checks whether there are any more values available.
Value	next() Gets the next value.

Method Detail

hasNext

public boolean hasNext()
                throws QueryEvaluationException

Checks whether there are any more values available.

Returns:

true if there are more values available, false otherwise.

Throws:

QueryEvaluationException

next

public Value next()
           throws QueryEvaluationException

Gets the next value.

Returns:

the next value.

Throws:

NoSuchElementException - If the iterator has no more results

QueryEvaluationException

close

public void close()

Closes the iterator and frees any resources that it uses (e.g. connections to databases). Every ValueIterator should be properly closed when it has returned all of its values, or when it is no longer needed.